3.1.0 - KKM K6 beaconsensor and Oral-B thoothbrush improvements

• Added support for KKM K6 beaconsensor custom-components/ble_monitor#835
• Split up of Oral-B toothbrushes in SmartSeries 7000 and IO Series 7 (by @codyc1515). The toothbrush sensor can now distinguish between the SmartSeries 7000 and IO series 7.
• Fix for missing Oral-B documentation custom-components/ble_monitor#844